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Message-ID: <20200721213119.32344-5-rcampbell@nvidia.com>
Date: Tue, 21 Jul 2020 14:31:18 -0700
From: Ralph Campbell <rcampbell@...dia.com>
To: <linux-rdma@...r.kernel.org>, <linux-mm@...ck.org>,
<nouveau@...ts.freedesktop.org>, <kvm-ppc@...r.kernel.org>,
<linux-kselftest@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: Jerome Glisse <jglisse@...hat.com>,
John Hubbard <jhubbard@...dia.com>,
Christoph Hellwig <hch@....de>,
Jason Gunthorpe <jgg@...lanox.com>,
"Andrew Morton" <akpm@...ux-foundation.org>,
Shuah Khan <shuah@...nel.org>,
"Ben Skeggs" <bskeggs@...hat.com>,
Bharata B Rao <bharata@...ux.ibm.com>,
"Ralph Campbell" <rcampbell@...dia.com>
Subject: [PATCH v3 4/5] nouveau/svm: use the new migration invalidation
Use the new MMU_NOTIFY_MIGRATE event to skip GPU MMU invalidations of
device private memory and handle the invalidation in the driver as part
of migrating device private memory.
Signed-off-by: Ralph Campbell <rcampbell@...dia.com>
---
drivers/gpu/drm/nouveau/nouveau_dmem.c | 15 ++++++++++++---
drivers/gpu/drm/nouveau/nouveau_svm.c | 21 +++++++++------------
drivers/gpu/drm/nouveau/nouveau_svm.h | 13 ++++++++++++-
3 files changed, 33 insertions(+), 16 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/nouveau_dmem.c b/drivers/gpu/drm/nouveau/nouveau_dmem.c
index 78b9e3c2a5b3..511fe04cd680 100644
--- a/drivers/gpu/drm/nouveau/nouveau_dmem.c
+++ b/drivers/gpu/drm/nouveau/nouveau_dmem.c
@@ -140,6 +140,7 @@ static vm_fault_t nouveau_dmem_fault_copy_one(struct nouveau_drm *drm,
{
struct device *dev = drm->dev->dev;
struct page *dpage, *spage;
+ struct nouveau_svmm *svmm;
spage = migrate_pfn_to_page(args->src[0]);
if (!spage || !(args->src[0] & MIGRATE_PFN_MIGRATE))
@@ -154,14 +155,19 @@ static vm_fault_t nouveau_dmem_fault_copy_one(struct nouveau_drm *drm,
if (dma_mapping_error(dev, *dma_addr))
goto error_free_page;
+ svmm = spage->zone_device_data;
+ mutex_lock(&svmm->mutex);
+ nouveau_svmm_invalidate(svmm, args->start, args->end);
if (drm->dmem->migrate.copy_func(drm, 1, NOUVEAU_APER_HOST, *dma_addr,
NOUVEAU_APER_VRAM, nouveau_dmem_page_addr(spage)))
goto error_dma_unmap;
+ mutex_unlock(&svmm->mutex);
args->dst[0] = migrate_pfn(page_to_pfn(dpage)) | MIGRATE_PFN_LOCKED;
return 0;
error_dma_unmap:
+ mutex_unlock(&svmm->mutex);
dma_unmap_page(dev, *dma_addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
error_free_page:
__free_page(dpage);
@@ -531,7 +537,8 @@ nouveau_dmem_init(struct nouveau_drm *drm)
}
static unsigned long nouveau_dmem_migrate_copy_one(struct nouveau_drm *drm,
- unsigned long src, dma_addr_t *dma_addr, u64 *pfn)
+ struct nouveau_svmm *svmm, unsigned long src,
+ dma_addr_t *dma_addr, u64 *pfn)
{
struct device *dev = drm->dev->dev;
struct page *dpage, *spage;
@@ -561,6 +568,7 @@ static unsigned long nouveau_dmem_migrate_copy_one(struct nouveau_drm *drm,
goto out_free_page;
}
+ dpage->zone_device_data = svmm;
*pfn = NVIF_VMM_PFNMAP_V0_V | NVIF_VMM_PFNMAP_V0_VRAM |
((paddr >> PAGE_SHIFT) << NVIF_VMM_PFNMAP_V0_ADDR_SHIFT);
if (src & MIGRATE_PFN_WRITE)
@@ -584,8 +592,8 @@ static void nouveau_dmem_migrate_chunk(struct nouveau_drm *drm,
unsigned long addr = args->start, nr_dma = 0, i;
for (i = 0; addr < args->end; i++) {
- args->dst[i] = nouveau_dmem_migrate_copy_one(drm, args->src[i],
- dma_addrs + nr_dma, pfns + i);
+ args->dst[i] = nouveau_dmem_migrate_copy_one(drm, svmm,
+ args->src[i], dma_addrs + nr_dma, pfns + i);
if (!dma_mapping_error(drm->dev->dev, dma_addrs[nr_dma]))
nr_dma++;
addr += PAGE_SIZE;
@@ -616,6 +624,7 @@ nouveau_dmem_migrate_vma(struct nouveau_drm *drm,
struct migrate_vma args = {
.vma = vma,
.start = start,
+ .pgmap_owner = drm->dev,
.flags = MIGRATE_VMA_SELECT_SYSTEM,
};
unsigned long i;
diff --git a/drivers/gpu/drm/nouveau/nouveau_svm.c b/drivers/gpu/drm/nouveau/nouveau_svm.c
index c5f8ca6fb2e3..67b068ac57b2 100644
--- a/drivers/gpu/drm/nouveau/nouveau_svm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_svm.c
@@ -93,17 +93,6 @@ nouveau_ivmm_find(struct nouveau_svm *svm, u64 inst)
return NULL;
}
-struct nouveau_svmm {
- struct mmu_notifier notifier;
- struct nouveau_vmm *vmm;
- struct {
- unsigned long start;
- unsigned long limit;
- } unmanaged;
-
- struct mutex mutex;
-};
-
#define SVMM_DBG(s,f,a...) \
NV_DEBUG((s)->vmm->cli->drm, "svm-%p: "f"\n", (s), ##a)
#define SVMM_ERR(s,f,a...) \
@@ -246,7 +235,7 @@ nouveau_svmm_join(struct nouveau_svmm *svmm, u64 inst)
}
/* Invalidate SVMM address-range on GPU. */
-static void
+void
nouveau_svmm_invalidate(struct nouveau_svmm *svmm, u64 start, u64 limit)
{
if (limit > start) {
@@ -279,6 +268,14 @@ nouveau_svmm_invalidate_range_start(struct mmu_notifier *mn,
if (unlikely(!svmm->vmm))
goto out;
+ /*
+ * Ignore invalidation callbacks for device private pages since
+ * the invalidation is handled as part of the migration process.
+ */
+ if (update->event == MMU_NOTIFY_MIGRATE &&
+ update->migrate_pgmap_owner == svmm->vmm->cli->drm->dev)
+ goto out;
+
if (limit > svmm->unmanaged.start && start < svmm->unmanaged.limit) {
if (start < svmm->unmanaged.start) {
nouveau_svmm_invalidate(svmm, start,
diff --git a/drivers/gpu/drm/nouveau/nouveau_svm.h b/drivers/gpu/drm/nouveau/nouveau_svm.h
index f0fcd1b72e8b..e7d63d7f0c2d 100644
--- a/drivers/gpu/drm/nouveau/nouveau_svm.h
+++ b/drivers/gpu/drm/nouveau/nouveau_svm.h
@@ -1,11 +1,21 @@
#ifndef __NOUVEAU_SVM_H__
#define __NOUVEAU_SVM_H__
#include <nvif/os.h>
+#include <linux/mmu_notifier.h>
struct drm_device;
struct drm_file;
struct nouveau_drm;
-struct nouveau_svmm;
+struct nouveau_svmm {
+ struct mmu_notifier notifier;
+ struct nouveau_vmm *vmm;
+ struct {
+ unsigned long start;
+ unsigned long limit;
+ } unmanaged;
+
+ struct mutex mutex;
+};
#if IS_ENABLED(CONFIG_DRM_NOUVEAU_SVM)
void nouveau_svm_init(struct nouveau_drm *);
@@ -19,6 +29,7 @@ int nouveau_svmm_join(struct nouveau_svmm *, u64 inst);
void nouveau_svmm_part(struct nouveau_svmm *, u64 inst);
int nouveau_svmm_bind(struct drm_device *, void *, struct drm_file *);
+void nouveau_svmm_invalidate(struct nouveau_svmm *svmm, u64 start, u64 limit);
u64 *nouveau_pfns_alloc(unsigned long npages);
void nouveau_pfns_free(u64 *pfns);
void nouveau_pfns_map(struct nouveau_svmm *svmm, struct mm_struct *mm,
--
2.20.1
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